<template>
<el-container class="home_container">
    <!-- 头部区域 -->
    <el-header>
        <div>
            <img src="../assets/heima.png" alt="图片丢失不见">
            <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--页面主体区域 -->
    <el-container>
        <!-- 侧边栏-->
        <el-aside :width="isCollapse ? '64px' : '200px'">
            <div class="toggle-button" @click="toggleCollapse">|||</div>
            <!-- 侧边栏菜单区 -->
            <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" :unique-opened="true" :collapse="isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">
                <!-- 一级菜单 -->
                <el-submenu :index="'' + item.id" v-for="item in menulist" :key="item.id">
                    <!--一级菜单的模板区域 -->
                    <template slot="title">
                        <!--图标 -->
                        <i :class="iconsObj[item.id]"></i>
                        <!--文本 -->
                        <span>{{item.authName}}</span>
                    </template>
                    <!--二级菜单 -->
                    <el-menu-item :index="'/' + subitem.path" v-for="subitem in item.children" :key="subitem.id" @click="saveNavState('/' + subitem.path)">
                        <!--图标 -->
                        <i class="el-icon-menu"></i>
                        <!--文本 -->
                        <span>{{subitem.authName}}</span>
                    </el-menu-item>

                </el-submenu>

            </el-menu>
        </el-aside>
        <!-- 右侧内容主体 -->
        <el-main>
            <!--路由占位符 -->
            <router-view></router-view>
        </el-main>
    </el-container>
</el-container>
</template>

<script>
export default {
    data() {
        return {
            // 左侧菜单数据
            menulist: [],
            iconsObj: {
                '125': 'iconfont icon-user',
                '103': 'iconfont icon-tijikongjian',
                '101': 'iconfont icon-shangpin',
                '102': 'iconfont icon-danju',
                '145': 'iconfont icon-baobiao',
            },
            // 是否折叠
            isCollapse: false,
            // 被激活的链接地址
            activePath: ''
        }
    },
    created() {
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout() {
            //清空 token 
            window.sessionStorage.clear()
            // 跳转到登录页面
            this.$router.push('/login')
        },
        //  获取所有的菜单
        async getMenuList() {
            const {
                data: res
            } = await this.$http.get('menus')
            if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
            this.menulist = res.data
            console.log(res)
        },
        // 点击按钮，切换菜单的折叠与展开
        toggleCollapse() {
            this.isCollapse = !this.isCollapse
        },
        //  保存链接的激活状态
        saveNavState(activepath) {
            window.sessionStorage.setItem('activePath', activepath)
            this.activePath = activepath
        }
    }
}
</script>

<style lang="less" scoped>
.home_container {
    height: 100%;
}

.el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;

    >div {
        display: flex;
        align-items: center;

        span {
            margin-left: 15px;
        }
    }

}

.el-aside {
    background-color: #333744;

    .el-menu {
        border-right: none;
    }
}

.el-main {
    background-color: #eaedf1;
}

.iconfont {
    margin-right: 10px;
}

.toggle-button {
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: .2em;
    cursor: pointer;
}
</style>
